LOCATION MILBURY OR
Established Series
Rev. MSA-JTH-TDT
06/2011
MILBURY SERIES
The Milbury series consists of moderately deep, well drained soils on mountains. They formed in colluvium and residuum weathered from sandstone. Slopes are 30 to 80 percent. The mean annual temperature is about 52 degrees F, and the mean annual precipitation is about 85 inches.
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Typic Humudepts
TYPICAL PEDON: Milbury very gravelly sandy loam - on a forested south facing slope of 78 percent at 1,650 feet elevation. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed duff layer consisting of branches, twigs, leaves, and fir needles.
A--1 to 11 inches; black (10YR 2/1) very gravelly sandy loam, dark gray (10YR 4/1) dry; weak fine and very fine granular structure; soft, very friable, nonsticky and nonplastic; many medium and fine roots; 50 percent gravel and 5 percent cobbles; strongly acid; clear smooth boundary. (10 to 20 inches thick)
BA--11 to 19 inches; very dark grayish brown (10YR 3/2) very cobbly loam, brown (10YR 5/3) dry; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many medium and fine roots and common very fine roots; 25 percent gravel and 20 percent cobbles; strongly acid; clear smooth boundary. (0 to 10 inches thick)
Bw--19 to 37 inches; brown (10YR 4/3) very cobbly loam, light yellowish brown (10YR 6/4) dry; weak fine and medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common fine and medium roots; 20 percent gravel and 35 percent cobbles; strongly acid; abrupt wavy boundary. (10 to 20 inches thick)
R--37 inches; sandstone.
TYPE LOCATION: Coos County, Oregon; 2 miles west of Loon Lake; 50 feet north of old logging road, 2,000 feet south and 200 feet west of the northeast corner, sec. 9, T. 23 S., R. 10 W.
RANGE IN CHARACTERISTICS: Solum thickness and depth to a bedrock is 20 to 40 inches. The soil is dry for 15 to 45 consecutive days in July and August. The particle-size control section has 35 to 60 percent rock fragments and 10 to 18 percent clay. The mean annual soil temperature is 50 to 55 degrees F. The soil is strongly acid or very strongly acid. The umbric epipedon is 10 to 20 inches thick.
The A horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 1 to 3 moist and dry. It has 20 to 50 percent gravel and 0 to 10 percent cobbles.
The Bw horizon has value of 3 to 5 moist, 5 or 6 dry, and chroma of 3 or 4 moist and dry. It is very gravelly loam, very gravelly sandy loam or very cobbly loam. It has 20 to 45 percent gravel and 10 to 35 percent cobbles.
COMPETING SERIES: These are the
Brightwood,
Harrington,
Klickitat,
Nordby,
Spivey,
Steever,
Summers, and
Wauld soils. Brightwood soils have a pH greater than 5.6. Harrington soils have hue of 5YR or 7.5YR and have 25 to 35 percent clay in the particle-size control section. Klickitat, Nordby, Steever and Spivey soils are deeper than 40 inches to bedrock. Summers soils lack a dry period. Wauld soils average 18 to 30 percent clay in the particle-size control section.
GEOGRAPHIC SETTING: Milbury soils are on ridges and sideslopes on uplands and mountains. They formed in colluvium and residuum weathered from sandstone. Slopes are 30 to 80 percent. Elevation is 100 to 2500 feet. The climate is characterized by cool wet winters and warm moist summers. The mean annual precipitation is 60 to 100 inches, mean annual temperature is 47 to 53 degrees F, and the frost-free period is 110 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Blachly,
Bohannon,
Digger,
Preacher,
Remote,
Rinearson, and
Umpcoos soils. Blachly soils have a fine particle-size control section and hue of 5YR. Bohannon and Preacher soils have a fine-loamy particle-size control section. Digger soils have an ochric epipedon and a paralithic contact at 20 to 40 inches. Remote and Rinearson soils are deeper than 40 inches to bedrock. Umpcoos soils are shallow.
DRAINAGE AND PERMEABILITY: Well drained; rapid runoff; moderately rapid permeability.
USE AND VEGETATION: These soils are used for timber production and wildlife habitat. Native vegetation is mainly Douglas-fir, western hemlock, red alder, Oregon-grape, western swordfern, blackberry, Pacific rhododendron, salal, huckleberry, and vine maple.
DISTRIBUTION AND EXTENT: The Coast Range in southern Oregon; MLRA 1. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Coos County, Oregon, 1983.
REMARKS: Diagnostic horizons and other features are;
Umbric epipedon from 1 to 19 inches
cambic horizon from 19 to 37 inches
National Cooperative Soil Survey
U.S.A.